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Ju Hwa Lee, Nam Jin Yoo, Min Sung Kim, Chang Hyeok An, Sug Hyung Lee
Loss of ZMPSTE24 is related to progeroid phenotypes in human. Cells in zmpste24-deficient mice show delayed DNA damage response, increased aneuploidy and increased genomic instability, which are considered features of cancer cells. The aim of this study was to address whether ZMPSTE24 gene was mutated in colorectal cancers (CRCs) and gastric (GCs), and its expression was altered. ZMPSTE24 possesses a T9 mononucleotide repeat in an exon, which could be mutated in cancers with defects in mismatch repair that can result in microsatellite instability (MSI)...
October 6, 2016: Pathology, Research and Practice
Koutaro Yokote, Sirisak Chanprasert, Lin Lee, Katharina Eirich, Minoru Takemoto, Aki Watanabe, Naoko Koizumi, Davor Lessel, Takayasu Mori, Fuki M Hisama, Paula D Ladd, Brad Angle, Hagit Baris, Kivanc Cefle, Sukru Palanduz, Sukru Ozturk, Antoinette Chateau, Kentaro Deguchi, T K M Easwar, Antonio Federico, Amy Fox, Theresa A Grebe, Beverly Hay, Sheela Nampoothiri, Karen Seiter, Elizabeth Streeten, Raul E Piña-Aguilar, Gemma Poke, Martin Poot, Renata Posmyk, George M Martin, Christian Kubisch, Detlev Schindler, Junko Oshima
Werner syndrome (WS) is a rare autosomal recessive disorder characterized by a constellation of adult onset phenotypes consistent with an acceleration of intrinsic biological aging. It is caused by pathogenic variants in the WRN gene, which encodes a multifunctional nuclear protein with exonuclease and helicase activities. WRN protein is thought to be involved in optimization of various aspects of DNA metabolism, including DNA repair, recombination, replication, and transcription. In this update, we summarize a total of 83 different WRN mutations, including eight previously unpublished mutations identified by the International Registry of Werner Syndrome (Seattle, WA) and the Japanese Werner Consortium (Chiba, Japan), as well as 75 mutations already reported in the literature...
September 26, 2016: Human Mutation
Chan-Il Choi, Ki Hyun Yoo, Syed Mohammed Qasim Hussaini, Byeong Tak Jeon, John Welby, Haiyun Gan, Isobel Scarisbrick, Zhiguo Zhang, Darren J Baker, Jan M van Deursen, Moses Rodriguez, Mi-Hyeon Jang
Myelination, the process by which oligodendrocytes form the myelin sheath around axons, is key to axonal signal transduction and related motor function in the central nervous system (CNS). Aging is characterized by degenerative changes in the myelin sheath, although the molecular underpinnings of normal and aberrant myelination remain incompletely understood. Here we report that axon myelination and related motor function are dependent on BubR1, a mitotic checkpoint protein that has been linked to progeroid phenotypes when expressed at low levels and healthy lifespan when overabundant...
September 12, 2016: Aging
Allison M Jay, Robert L Conway, Isabelle Thiffault, Carol Saunders, Emily Farrow, John Adams, Helga V Toriello
Wiedemann-Rautenstrauch syndrome, also known as neonatal progeroid syndrome, is a rare condition with fewer than 40 patients reported in the literature. Characteristic physical findings include neonatal progeroid appearance, sparse scalp hair, prominent scalp veins, and lipoatrophy; in addition, neonatal teeth are often a distinctive finding. The inheritance pattern of this disorder has been postulated to be autosomal recessive, although a specific gene has not been identified. Here we report an infant with the characteristic phenotypic features of Wiedemann-Rautenstrauch syndrome in whom exome sequencing identified two pathogenic variants in POLR3A: c...
September 9, 2016: American Journal of Medical Genetics. Part A
Mohammed Al-Bughaili, Teresa M Neuhann, Ricarda Flöttmann, Stefan Mundlos, Malte Spielmann, Uwe Kornak, Björn Fischer-Zirnsak
Gerodermia osteodysplastica is a recessive segmental progeroid disorder mainly characterized by wrinkled skin, generalized connective tissue weakness, infantile onset osteoporosis and normal intelligence. Coding mutations in GORAB, localized on chromosome 1q24.2, are the cause of this disease. 1q24 deletions underlie a spectrum of disorders with intellectual disability and ear abnormalities as phenotypic hallmarks. Here we report on an individual from Azerbaijan originating from a non-consanguineous couple showing short stature, cutis laxa, frequent fractures, facial dysmorphism, cup-shaped ears and intellectual disability...
September 8, 2016: Journal of Human Genetics
Ryan R White, Jan Vijg
DNA double-strand breaks (DSBs) are rare, but highly toxic, lesions requiring orchestrated and conserved machinery to prevent adverse consequences, such as cell death and cancer-causing genome structural mutations. DSBs trigger the DNA damage response (DDR) that directs a cell to repair the break, undergo apoptosis, or become senescent. There is increasing evidence that the various endpoints of DSB processing by different cells and tissues are part of the aging phenotype, with each stage of the DDR associated with specific aging pathologies...
September 1, 2016: Molecular Cell
Mari Tokita, Scott R Kennedy, Rosa Ana Risques, Stephen G Chun, Colin Pritchard, Junko Oshima, Yan Liu, Peter K Bryant-Greenwood, Piri Welcsh, Raymond J Monnat
Werner syndrome (WS) is the canonical adult human progeroid ('premature aging') syndrome. Patients with this autosomal recessive Mendelian disorder display constitutional genomic instability and an elevated risk of important age-associated diseases including cancer. Remarkably few analyses of WS patient tissue and tumors have been performed to provide insight into WS disease pathogenesis or the high risk of neoplasia. We used autopsy tissue from four mutation-typed WS patients to characterize pathologic and genomic features of WS, and to determine genomic features of three neoplasms arising in two of these patients...
2016: Scientific Reports
W P Vermeij, M E T Dollé, E Reiling, D Jaarsma, C Payan-Gomez, C R Bombardieri, H Wu, A J M Roks, S M Botter, B C van der Eerden, S A Youssef, R V Kuiper, B Nagarajah, C T van Oostrom, R M C Brandt, S Barnhoorn, S Imholz, J L A Pennings, A de Bruin, Á Gyenis, J Pothof, J Vijg, H van Steeg, J H J Hoeijmakers
Mice deficient in the DNA excision-repair gene Ercc1 (Ercc1(∆/-)) show numerous accelerated ageing features that limit their lifespan to 4-6 months. They also exhibit a 'survival response', which suppresses growth and enhances cellular maintenance. Such a response resembles the anti-ageing response induced by dietary restriction (also known as caloric restriction). Here we report that a dietary restriction of 30% tripled the median and maximal remaining lifespans of these progeroid mice, strongly retarding numerous aspects of accelerated ageing...
August 24, 2016: Nature
Sei-Ichiro Motegi, Akihiko Uchiyama, Kazuya Yamada, Sachiko Ogino, Yoko Yokoyama, Buddhini Perera, Yuko Takeuchi, Osamu Ishikawa
Atypical progeroid syndrome (APS), including atypical Werner syndrome (AWS), is a disorder of premature ageing caused by mutation of the lamin A gene, the same causal gene involved in Hutchinson-Gilford syndrome (HGS). We previously reported the first Japanese case of APS/AWS with a LMNA mutation (p.D300N). Recently, it has been reported that UVA induced abnormal truncated form of lamin A, called progerin, as well as HGS-like abnormal nuclear structures in normal human fibroblasts, being more frequent in the elderly, suggesting that lamin A may be involved in the regulation of photoageing...
August 2016: Experimental Dermatology
Romina Burla, Mariateresa Carcuro, Mattia La Torre, Federica Fratini, Marco Crescenzi, Maria Rosaria D'Apice, Paola Spitalieri, Grazia Daniela Raffa, Letizia Astrologo, Giovanna Lattanzi, Enrico Cundari, Domenico Raimondo, Annamaria Biroccio, Maurizio Gatti, Isabella Saggio
AKTIP is a shelterin-interacting protein required for replication of telomeric DNA. Here, we show that AKTIP biochemically interacts with A- and B-type lamins and affects lamin A, but not lamin C or B, expression. In interphase cells, AKTIP localizes at the nuclear rim and in discrete regions of the nucleoplasm just like lamins. Double immunostaining revealed that AKTIP partially co-localizes with lamin B1 and lamin A/C in interphase cells, and that proper AKTIP localization requires functional lamin A. In mitotic cells, AKTIP is enriched at the spindle poles and at the midbody of late telophase cells similar to lamin B1...
August 2016: Open Biology
Yoshikazu Johmura, Emiri Yamashita, Midori Shimada, Keiko Nakanishi, Makoto Nakanishi
Susceptibility to senescence caused by defective DNA repair is a major hallmark of progeroid syndrome patients, but molecular mechanisms of how defective DNA repair predisposes to senescence are largely unknown. We demonstrate here that suppression of DNA repair pathways extends the duration of Chk1-dependent G2 checkpoint activation and sensitizes cells to senescence through enhancement of mitosis skipping. Extension of G2 checkpoint activation by introduction of the TopBP1 activation domain and the nondegradable mutant of Claspin sensitizes cells to senescence...
2016: Scientific Reports
Badr Ibrahim, Angela N Sheerin, Katrin Jennert-Burston, Joe L E Bird, M V Massala, Matthew Illsley, S Elizabeth James, Richard G A Faragher
Werner's syndrome (WS) is an autosomal recessive genetic disorder caused by loss of function mutation in wrn and is a useful model of premature in vivo ageing. Cellular senescence is a plausible causal mechanism of mammalian ageing and, at the cellular level, WS fibroblasts show premature senescence resulting from a combination of telomeric attrition and replication fork stalling. Over 90% of WS fibroblast cultures achieve <20 population doublings (PD) in vitro compared to wild type human fibroblast cultures...
October 2016: Experimental Gerontology
Yihang Li, Linda Hassinger, Travis Thomson, Baojin Ding, James Ashley, William Hassinger, Vivian Budnik
Defective RNA metabolism and transport are implicated in aging and degeneration [1, 2], but the underlying mechanisms remain poorly understood. A prevalent feature of aging is mitochondrial deterioration [3]. Here, we link a novel mechanism for RNA export through nuclear envelope (NE) budding [4, 5] that requires A-type lamin, an inner nuclear membrane-associated protein, to accelerated aging observed in Drosophila LaminC (LamC) mutations. These LamC mutations were modeled after A-lamin (LMNA) mutations causing progeroid syndromes (PSs) in humans...
August 8, 2016: Current Biology: CB
Karim Harhouri, Claire Navarro, Camille Baquerre, Nathalie Da Silva, Catherine Bartoli, Frank Casey, Guedenon Koffi Mawuse, Yassamine Doubaj, Nicolas Lévy, Annachiara De Sandre-Giovannoli
Progeroid laminopathies, including Hutchinson-Gilford Progeria Syndrome (HGPS, OMIM #176670), are premature and accelerated aging diseases caused by defects in nuclear A-type Lamins. Most HGPS patients carry a de novo point mutation within exon 11 of the LMNA gene encoding A-type Lamins. This mutation activates a cryptic splice site leading to the deletion of 50 amino acids at its carboxy-terminal domain, resulting in a truncated and permanently farnesylated Prelamin A called Prelamin A Δ50 or Progerin. Some patients carry other LMNA mutations affecting exon 11 splicing and are named "HGPS-like" patients...
2016: Cells
Panagiotis Mistriotis, Vivek K Bajpai, Xiaoyan Wang, Na Rong, Aref Shahini, Mohammadabad Asmani, Mao-Shih Liang, Jianmin Wang, Pedro Lei, Song Liu, Ruogang Zhao, Stelios T Andreadis
Cellular senescence as a result of organismal aging or progeroid diseases leads to stem cell pool exhaustion hindering tissue regeneration and contributing to the progression of age-related disorders. Here we discovered that ectopic expression of the pluripotent factor NANOG in senescent or progeroid myogenic progenitors reversed cellular aging and restored completely the ability to generate contractile force. To elicit its effects, NANOG enabled reactivation of the ROCK and TGF-β pathways - both of which were impaired in senescent cells - leading to ACTIN polymerization, MRTF-A translocation into the nucleus and SRF-dependent myogenic gene expression...
June 28, 2016: Stem Cells
Clara Soria-Valles, Dido Carrero, Elisabeth Gabau, Gloria Velasco, Víctor Quesada, Clea Bárcena, Marleen Moens, Karen Fieggen, Silvia Möhrcken, Martina Owens, Diana A Puente, Óscar Asensio, Bart Loeys, Ana Pérez, Valerie Benoit, Wim Wuyts, Nicolas Lévy, Raoul C Hennekam, Annachiara De Sandre-Giovannoli, Carlos López-Otín
BACKGROUND: Progeroid syndromes are genetic disorders that recapitulate some phenotypes of physiological ageing. Classical progerias, such as Hutchinson-Gilford progeria syndrome (HGPS), are generally caused by mutations in LMNA leading to accumulation of the toxic protein progerin and consequently, to nuclear envelope alterations. In this work, we describe a novel phenotypic feature of the progeria spectrum affecting three unrelated newborns and identify its genetic cause. METHODS AND RESULTS: Patients reported herein present an extremely homogeneous phenotype that somewhat recapitulates those of patients with HGPS and mandibuloacral dysplasia...
June 22, 2016: Journal of Medical Genetics
Emmanuelle Nicolas, Erica A Golemis, Sanjeevani Arora
The evolutionarily conserved human polymerase delta (POLD1) gene encodes the large p125 subunit which provides the essential catalytic activities of polymerase δ (Polδ), mediated by 5'-3' DNA polymerase and 3'-5' exonuclease moieties. POLD1 associates with three smaller subunits (POLD2, POLD3, POLD4), which together with Replication Factor C and Proliferating Nuclear Cell Antigen constitute the polymerase holoenzyme. Polδ function is essential for replication, with a primary role as the replicase for the lagging strand...
September 15, 2016: Gene
Barbara Pascucci, Mariarosaria D'Errico, Alessandra Romagnoli, Chiara De Nuccio, Miriam Savino, Donatella Pietraforte, Manuela Lanzafame, Angelo Salvatore Calcagnile, Paola Fortini, Sara Baccarini, Donata Orioli, Paolo Degan, Sergio Visentin, Miria Stefanini, Ciro Isidoro, Gian Maria Fimia, Eugenia Dogliotti
The ERCC8/CSA gene encodes a WD-40 repeat protein (CSA) that is part of a E3-ubiquitin ligase/COP9 signalosome complex. When mutated, CSA causes the Cockayne Syndrome group A (CS-A), a rare recessive progeroid disorder characterized by sun sensitivity and neurodevelopmental abnormalities. CS-A cells features include ROS hyperproduction, accumulation of oxidative genome damage, mitochondrial dysfunction and increased apoptosis that may contribute to the neurodegenerative process. In this study, we show that CSA localizes to mitochondria and specifically interacts with the mitochondrial fission protein dynamin-related protein (DRP1) that is hyperactivated when CSA is defective...
June 9, 2016: Oncotarget
Pallavi Tyagi, Zain Juma, Aravind R Reddy
BACKGROUND: Mulvihill-Smith syndrome is a rare progeroid syndrome of sporadic nature. Previously reported ophthalmological findings include astigmatism, myopia, endothelial dystrophy, keratoconus, cataract, band keratopathy, meibomian gland dysfunction, dry eye disease, amblyopia, and allergic conjunctivitis. MATERIALS AND METHODS: The proband, a 25-year-old male subject diagnosed with Mulvihill-Smith syndrome in childhood developed retinal changes with onset of adulthood...
June 8, 2016: Ophthalmic Genetics
Xiaoxiao Guo, Chao Ling, Yongtai Liu, Xue Zhang, Shuyang Zhang
Mutations in the gene LMNA cause a wide spectrum of diseases that selectively affect different tissues and organ systems. The clinical features of these disorders can overlap but be generally categorized into 2 groups: cardiomyopathy and neuromuscular disorders; premature aging and lipodystrophy disorders. It is significant for a single patient who harbours the 2 sets of diseases simultaneously. We present a female patient with a unique phenotype including rare atypical progeroid syndrome and dilated cardiomyopathy...
September 2016: Canadian Journal of Cardiology
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